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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802d6f4c7ed45b9c6fb9e1caf6c689b400b3320e20a38c95bf219ec3baf9f710' 
  AND token = 'bwRyD/tKFdwkyCzynosv1yN6Qty2enj2Lo8uXQvsdvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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