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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7353124e34265f7ebd10aaf95b2aaea870693a23995fb6e1ddb9454d83408adc' 
  AND token = 'N3ilkMQK0kmBdrLC4yXgL8e+duYAxnZzkHr0/LPm16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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