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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968830a12ec30a36b7c3a5e807e70e1b9e1ba805fb3ee8d31a62729d49cd61e7' 
  AND token = 'IZDkU6K2KOQvA8hINbd1QCkuxR+OPLIEQ4JKFU6naFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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