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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dffe379fc1c1be44158514f6db71993dedcfb9820f17444bfc75b2d7a795dc' 
  AND token = 'G9W2lJf0XGwdaJUut3Fplv8NFw0nrDP+qAa8z8FnJXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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