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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7991746153840b9626f425a5e61b8415f0740bf097657edd49e2514b49488bf0' 
  AND token = 'qqpWiqiZ6qonJROCmUJtISYPs98vLc49XAGVp6OimRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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