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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74e3f5f8e894e9a1bd8ca822439d38665cdba5d97aae6e6e40ef0c93d437c1e' 
  AND token = '2+six68B8+pqtv3/9PDH8L2NtmHDvM2LSy2+wmJdtBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}