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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288624d50865e2954ff94c8829bed48a555b44b14fb01ee48c0b8f858b048b20' 
  AND token = 'tjyODfFCZTUFT3OcOUrLjfXeBXXpIokg9MVuk58wT+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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