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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9099deb621e90304f1f290d9ee80a25118a93ee6192d6d30b9cc317b90b64735' 
  AND token = 'X1LnRsor9rbMg86oJ0nGQbY5v3w+s++yOSTMQPQKx7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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