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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f3a4733ffc4966abc2f304b7235a34c42e900d3f5f7a6c8ef41008c9cbb19c' 
  AND token = 'aWYHoKSlhKTaWTJ2feRutqxiHS/e0WsXmt1FjzPflQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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