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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c935a7497e955f02429ba74b8e46617d21989bfc06eb2edd84c7233ae81072d8' 
  AND token = 'FfnTXAXvhHu5fcQtT+6vJ+mdQERoole2WYKdLLvF+Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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