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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0fe93eb8ac092090e88a2777512e5b23d2edddc6599f9536d1ae7b078531fb' 
  AND token = 'bOZZyeBJZ/Yu1B/4u9BovEjg6z80AisXSpnCHuNicQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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