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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6445604e0aed806962bd43c59f2a1ffde47ead047bc3045571e73d9b79b1381' 
  AND token = 'XHsDb8WlMl2ZVLM3FlH/w03dfMIf1TC0X4pZ5tMdrs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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