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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdd5d78be9ee75af319fd856d2c0129c865ad4948e7be7b57439a9aeb81c5b8' 
  AND token = 'C8ak2GGIETS+otvuAmwHu1sQBlv9pWSDLew649NY8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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