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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2568a77d8ab82616f5ae4320d6e9b26738c7800206d1b07858b02f8de0fcef89' 
  AND token = '36Qc43GA2nTpaB7RxOx/RHDI54GSvuwHswTlin4cXLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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