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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec947e30f162bb7bef65886c3c84dc99ab93677241ea6932ba9e66ec06aca50' 
  AND token = 'rlgB5aeUr62zrYMrPoUJpsc9Rob2VO81O2+ImX46/Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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