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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804dc7f690895d9ed180ecef6a958f47570a0c70e404f7f2f5459546f61a111c' 
  AND token = 'eDKhTruIGmLIf6CLtQhWfhtBIOoRAsUGCy7CFMdVsr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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