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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bdf27e865ade383791c4b5830775066544a5ec47935b439ee177b7b5427a24' 
  AND token = 'N5iC0hYLojCn5w0NyDaimKZTwFv+tGFueJuX6GYlXdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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