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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa478e7c86192c479788b1974cf92aef63143a368d9d9a0c9a9ed92e1f57f393' 
  AND token = 'l9oCILeA/ttSerPJ5Kpb6AVxsJmyQBUX8WulDyao9vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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