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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3f79500d908982edc38525deb32cfe01fa828fc5f1d2dd797a83af65dc6c9c' 
  AND token = 'tmpshJujEQ4mxu6agaRm3qZV37beobninETTfGF/i2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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