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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a6796376619c269eb41b3f8cbee608adbd7957bc863ffc86c9b022f9533d38' 
  AND token = 'fLaBFRFMT/zqVYTysNEFsZ7EKasFEaUAUf77+94D6os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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