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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed41c4c667ca82d2d76339e41ef2b851a31cd06afd01a540d7c0b02f1f0ea5b1' 
  AND token = 'vYtoscS7OJNyGVFhHDAas9g7XIgtgCwY4WNg12jSX80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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