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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c18da60896dfd61f6f150119278e880e572c90676d430de4124d52690e94fa' 
  AND token = 'NwwhN7Lb8fGTy022WKYu0lkqUz2PE54NVqeDTM4a0H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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