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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc80315a5fd99d095bb1fcc2c225a54d79d0e6a87c3f735b51a04ccf939e9f63' 
  AND token = 'vYpedvxiu9i7kU4QBM8j3PaWGNi6v99LwRzwWAdc/Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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