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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76829bd8fdebbf12add7876984c838f5c83bc43f91d69ca7e8940a22edc25459' 
  AND token = 'NeVx6kYV/xSwvvYYEJPg352XlfO0mIEirXgyxIo53qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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