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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0231c85525a781d9eb3adad86d358c9babc722f1cee69a2de07a76aa0bdd85' 
  AND token = '6dNYOS3P0W2U7gLbz+ap22Oa1KrW1KkhDTfaduucpQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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