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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafa326dc1e7841e1aed07dbd6572d6c202245079958023295fbf66de198916e' 
  AND token = '8buO3YZV1UVhdqFcY9wuQHsGQ97AdRR2hxPO/LshtVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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