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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9272ab25b6a5fbd08e7a0c5a71ac3cf9c0dca259112a5e4ce64d95e94ae6fe6c' 
  AND token = 'fdWv29q0HYyNABuqR9WZXSjerjtPb+MSwolIfYLZBek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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