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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a4b8bea43b51231f9dd516807e6a21d3a8c8ea5fc3d656277a1405eaf2c15c' 
  AND token = '1+cOIbBdfHUuDfW+mHQwiLKvpaMrYvWUe0MkfoWe1kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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