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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8cc213a76247d9cd74fb75b83e6f7470d20a829b8c0773815481e202032052' 
  AND token = 'tupoFSyAfD5kBFV2cDpzS2riryho4LS8YkrQLxDtoyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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