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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f849f13036a1f2150dec86e734b2933896a6f1882d150d5aa601648fd89843' 
  AND token = 'j6u9JngCgAZU0WxSjTgKfzuJuNX5Pl7iw6Xf5PZS0Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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