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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09374fb7540046f4d58a066b5da9004aaf49c00210ed1bd127cb84f8980260b' 
  AND token = 'sGvIRc2hIgY2scfQq2uYuoy70K02UtpA7NnOkz9idf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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