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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93eb77ab60d33bb10d255a40bc9151cb68bcca1a6f5428ff3979b2c708db142' 
  AND token = 'xBEYx0BesdWA7aW/ujBU95H35bSs+bgsU1KVuMI7qQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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