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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c1811c1800c22809e653d7bab8f5269c41712c488578974a9f96cc361835f3' 
  AND token = 'Lxe1EoCPZ1//UlJinbJeN05/UpHOypfUz1ETuJJVdac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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