SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa05677f262e4b5d845949f7703a7668cc8300925bee273b6e2110c796204abf' 
  AND token = 'VODuj52TxcRh/em5KIYUUs2XrSNHz9QnIW+qY3Kv5JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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