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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69080616981e06892122cbbdd9e1fa997ad921b439516d8636e338196ec10b29' 
  AND token = '2B4wN/3M+a3xScEqHjeOkht7it3piqi9RJS5I2GCRjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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