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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f17d9accfae98ea6173512c9013b69d92632816398e173a9c383efc2a877fa' 
  AND token = '8Eekr2kZI3VtugYHKKhTwyYV5cLxAfofx/zVuqFWmUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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