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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11ed15b2a3f7c4f76e88b56873e5b49d7475d9f20ffbf81bf4b40c9570fcd5d' 
  AND token = 'aFUf1KCrnuozN4s0L8hlgMWOehE8KTuYDfSectf1rec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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