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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c44f56423f53bbf3db85073c21b2f30001ba99245bc81c92916515ebdb39bed' 
  AND token = 'hnvhGw6103Xp6ysUS5IJC875tp0Cy+Jh/IylqjuazvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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