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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b78ea0d20ba685159087651921e19bf0f594322004990069869aebd7f808b1' 
  AND token = 'czaWvcFhi8nwdWwD5i3KUQL5262thAhg4vb1xRcTk2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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