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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04517f8f697fbb34049ee1d97f9c824ac48c3c53a1b5b1b6657b811bc0f946c7' 
  AND token = 'ObGdL2CXCbRxfHYXtMRKmFt11uE2xEEnZGiqDlf9JZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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