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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa33df9cf3de458fe05ca804aa45cccace00fab236b5eebb75ade38e8b9d4e01' 
  AND token = 'HikWPnSlcBf4yXrM4XG6Vk1pX8zaMBTclrWCc1r5/+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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