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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7b70953aa676d5dffd326461a25f2950a7f357ebf2ba65bd62e2757fc3f4f4' 
  AND token = 'XLXOzgPA4ZnSSSsSeIe6CydEgWyskthYeZQ6tDjKt/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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