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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3924a2fd4182d6e068d34820edc6e662a4d4c951fb0bfb063bce5f4c6286b5' 
  AND token = '7JFhsHFwIZButMEJizkynwDrhV1T9J9dgFwzgSg09HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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