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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162f442fc4d8d7524f5d42d86c6964cdc241b4de2fe579ec0aa50f88dd73eee7' 
  AND token = 'G9ykVXRgM6I3ifSgz4D/xGAUnDUhU6vRQaWeryvUIzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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