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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f262170b992d8ddd3b1e4ca39dbf26e5f6cc4a5e3d0cb28e932c61f9edb106' 
  AND token = 'Ia/JtplexM3HWG+5hcWpEimLhIb3hEtOvUqKO9k+LnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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