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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc986b20cc3eb25cec9d6c6b8a8b676bad601e61d16f2c41e7f8546a9094203' 
  AND token = 'FAUtMOMk9luo8G8+cG+Pl4IGELL5lP3fUhlySnlq/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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