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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd2b28f2cb64a59a47612dee914d4d71ad3d67c759826710106c0caefa3181d' 
  AND token = 'sAoehrU+r+dgDfBHQkFf1HRj2Fhe9tNRAuHg4hCb+P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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