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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a387a8c6a19091d94189b26931c40e476f63a24dd1d83c06368fe23d666021' 
  AND token = 'XB3GYNF/rZvx6+TnhYp6eDeU3dE10Yh/+Worf8ToyVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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