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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f47c287f9f6f42180e3a292ff8169a6d000262c21064eaeb97a6f3993fcb3d' 
  AND token = '8A9PuQff6OsB8Oo+agND71HtcFnkFhGEgvDEvFYphzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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