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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e287b5207cb31435fbbb8ce29c679db1c3d6846c17a22bcd023e73247694456' 
  AND token = '1csHAeoasEvnOFjjv8RcxuosRa/SASVbKhijhF/DZ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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