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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b62f8e0b295dbfcfcc48f89be7a3f3ecf10f16f0d36ae7930759f7726a5eb3b' 
  AND token = 'KSfPQ6Pa70OzIfjcc63inRwxUFP8dasbRarDCJP2DZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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