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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304e9f1ec735c341e037ac08df726759856a7732b272c8455aae82a05e994f2d' 
  AND token = 'YWQbP9VKMcJB031X8/p0VYMi/n6pJj2/h/rX2lT4Y2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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