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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bfb15fd43e14582f7338b3819e9e2a49fbbd6395000e53bf5318deacd22a33' 
  AND token = 'vH4FS5GJACpQ7eucd01gqKXWGl4FglW7/U9QOTqjQzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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