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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa684ab0f63cb7ae83ca1f89e30e59fd13e06df7ae94e2ad5ca3c456340aabd1' 
  AND token = '6801DfleLlxCGuWW9TD0U28VRkCcS6cZsiM3ToKtxJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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