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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1667bf83ae8bdbbb88b988a1280978b6c904ae93ed1b631c24dbea4fe52573c' 
  AND token = 'l6OGHeAGr/dq104lv6UBYb94BsVEq1i3NR1TscKrMYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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