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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473d95ec763dfdfedde7384b35ff2512a1901e631fddcea42d767a70091b88d8' 
  AND token = 'Cq38gM+L8p4vVwPiJCulL9dur3ip+kuC8JI50/C2vak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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