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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f34ddf607c7f3fb637c0d1575cf3119f3236c461e428a7a72b3ae4274f0200' 
  AND token = 'KaHNGk/dxe4iO8ditGEtSDrwt36M9TmmHK1M0yzSZsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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