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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d71f6fc8585d165a9a1d462d271c9918ded43b9718179d7a973ac71a90a6dd' 
  AND token = 'mGtt8bsqshkFA9Gx7iVhLk7E/ajJFQos/wRDd52mXMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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