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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3edb468600dae6252f7dec7787ec9ada7813d01e4abf4f3462719eef3b39aa8' 
  AND token = '76gn6U+o043LKeQi6a9+zkCN7HKOOKfSaVnU0HlXH7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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