SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967e58b3362811d895ea688bafca1a7182321fe502e4348beb54e9f31b3785c0' 
  AND token = 'JvOVxIuA2pG7HHBhQ7PuJno4/QXXiU6vzvqfEqpaxB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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