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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f761ab6ad24d34310fec277146f3b9dc4e262e41ed0480e5d55ac256838439ff' 
  AND token = 'YdPWbtflryQU0zw7NqHJinmSyR0Ump2yMw4OnQe/jpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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