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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9579ef7e4db56c60d2d844c17ff58a19bd9fd652fc1630514db182eb4397c49c' 
  AND token = '9yR369PW1yhM/F1IHtP2ZHOYJ4rnXOZZTJ0rESDk+f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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