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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2979175eebadd1668572816d1ecd96268a9e8500ccb4fc25a41cc676ecff8c1d' 
  AND token = '9a/ZKULYKfqNIi5MQ9FnPhKPynH1LmfZGA5m4gNaizg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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