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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eea9e0d285598561b4cda3225f44aeaf454b00e4a955afeb57a68cd4a069c8' 
  AND token = 'UNMw+hOGkgoOEcBfcJFe6DWNNkEer9M2zAd/SvOfz64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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