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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f09ac69f281466fc89d3f45dff92a9bd4fba7ca6d7fa3eca3a93c4c8a73805' 
  AND token = 'QVRiPPXHWnH1++JD3xK5i+Lvf5vdnRLyEptmIMdCS70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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