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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dfe7e8f245f365bfbaa6733636f1ff05ec118f26645f8c77a82b808749a6bf' 
  AND token = 'dJ9Qlx37PKz0ur2FhndCBZoyva4Mlnfou8GjPSFS7tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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