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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585b7c90192df3fa2d79fb7b8aa94fdd3441410ed9cac220f32cd4025a89d1d5' 
  AND token = 'duFO+KJT7Bw45Sdood2jN9XHfMWeEajJZBLAlZ6Yny8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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