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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0c455353a83114d6ef160a0fc87535b3875c17a3ab94f4d6ec88e9eb8a3f7b' 
  AND token = 'LlOsHU3f6pfy2LmQUR+79620x3fsFvo+W7gYrYmhPdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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