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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd0c41a2af9b2451ebab0edc22ffa5ffd464c27944cddd1496d20bc0bde260d' 
  AND token = 'FtuzesVO76dg/KwCb9Js7tS/XWWLlsL1jJXmsqiRl3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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