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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139e03aed83737de6ac1f13c00a5c5de98ad1dc611fe9eed6a8f1427efc0c1fb' 
  AND token = 'wA2Ro2XD65tv7568XNfqRRlww09WYvSTbalLEd0hHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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